Hi Pierre!
On 07/18/2018 10:25 PM, Pierre Muller wrote:
> Maybe I was finally successful:
>
> stadler seems to have come into troubles after runing a single (faulty) executable
>
> the executable is in
> /home/pierre/pas/test directory
>
> its name is
> ./tweaklib2
>
> it uses a (probably faulty) library called
> ./libtweaklib1.so
>
> both are 64-bit executable generated with the current Free Pascal compiler
> on my account, located in directory
> /home/pierre/pas/fpc-3.1.1/bin/ppcsparc64 (cross compiler from 32 to 64 bit)
>
> Last things I did was
> recompiling those two sources, using
>
> pierre@stadler:~/pas/test$ ppcsparc64 -gl tweaklib1.pp -k-rpath -k. -Cg -n -Fu../trunk/fpcsrc/rtl/units/sparc64-linux
> pierre@stadler:~/pas/test$ ppcsparc64 -gl tweaklib2.pp -k-rpath -k. -Cg -n -Fu../trunk/fpcsrc/rtl/units/sparc64-linux
>
> Running simply ./tweaklib2
> generated a SIGILL which stopped the program without any core generation...
>
> Running it inside gdb did not help,
> SIGILL was not caught by GDB :-(
>
> Running it with strace generated this message:
> rt_sigaction(SIGBUS, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, NULL, 0xffff800100134ca8, 8) = 0
> rt_sigaction(SIGILL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, NULL, 0xffff800100134ca8, 8) = 0
>
> Message from syslogd@stadler at Jul 18 20:04:02 ...
> kernel:[206085.986213] usercopy: Kernel memory exposure attempt detected from process stack (offset 0, size 128)!
Great. Looks like we have a reproducer for the kernel developers now :).
> I tried to access via a second ssh session to the machine,
> but the session froze also, and I finally got completely kicked out,
> probably due to a system shutdown...
>
> This kernel crash might be easier to reproduce than any of what I got before ...
>
> I am still unable to reconnect to the machine,
> so maybe someone can resart the machine,
> and test if running the tweaklib2 in /home/pierre/pas/test directory
> several times or with strace is sufficient to get a 'reproducible' crash.
>
> In the hope that this will help,
Just did a hardware reset, should be back shortly.
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaubitz@xxxxxxxxxx
`. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx
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